It was explained above, they’d need to update previous versions of Cubase to utilise the new licensing as it’s baked in to each module and function that you run.
This would mean creating an environment where they can load up the builds for each version and devote staff into going back through that code and repeating all the work they had to do in C12. And doing this alone may lead to the software not being able to run on the same O/S as it does now, due to the libraries and supporting files that the new licensing system requires.
It would be an impossible task to do this without additional funding, so if they were to do it and pass the costs on to end users it would likely be greater than just paying for an update to the new licensing system.
(IMO) Reaper is the only true alternative if you want to keep ownership of your software and not be at the mercy of paid updates. Plus the developers are active in communicating with users.
The likes of Logic and Studio One look like they will be heading further into the subscription model. Presonus already removed their forum, Apple you’re pretty much on your own and can’t communicate with developers as we can here.
This is the problem with DAW’s that are a suite of managed tools, there’s a lot of costs involved but that should be offset by the value you receive via the paid updates with new features and plugins.
If you don’t think there’s value in updating, and not prepared to take the route of a second hand dongle in future to keep yourself operating, Then you need to look elsewhere, clearly. But just be aware that this is your decision to corner yourself in this manner because you’ve decided it’s “blackmail”.
Personally, I think the best alternative to C10 is C14.
I don’t see many companies operating as Steinberg in regards to receiving a genuine perpetual license that only needs to be activated once per machine, and offering a forum like this for support and frequent Q&A sessions via their youtube channel.
Just consider your options carefully, it’s easy to only see the negatives.